Transvaginal ultrasound questions

Out of four pregnancy this is my first one. They want to check my placenta and size of baby. I'm 32 weeks. 
I'm nervous!! 
Should I be? Anything I should expect and not be scared? 
I had one baby born full term and died of gbs sepsis at 28days spent the whole time in nicu . 
So my doctor try's to not check me or mess around down there but since this ultrasound is suppose to be a clearer view they said baby should be fine.